Introduction. The health status of modern children and adolescents is determined by the complex impact of various nature of many factors. The achieved level of physical development clearly reflects younger generation health status both on the individual and on the population level. Compliance with quarantine measures caused by the spread of COVID-19 in 2020-2021 required significant change in younger generation lifestyle, realizing delayed in time effects. Objective: to assess the delayed effects of the restrictive measures introduction during the COVID-19 pandemic on the children and adolescents physical development in the Russian Federation. Materials and methods. Physical development in 2021-2024 was assessed in 3,756 in grades 1-5 aged 7-11 years living in various regions of the Russian Federation Central Federal District. Also in 2024, impedance measurement was performed on 885 study participants. Results and discussion. We have not found statistically significant differences in the studied anthropometric parameters (body length and weight, chest circumference, subcutaneous fat folds). However, it should be noted that there is a tendency for the body length average values to increase, which is most pronounced in the group of 11-years-old boys (p=0.054). Correlation analysis demonstrated the presence of significant strong direct relationships between most of the studied anthropometric parameters and body component composition. In addition, it should be emphasized that there are no significant relationships between the studied parameters and visceral fat mass, which indicates a small number of overweight children and adolescents in the sample. In turn, a high degree of correlation between body length, weight, chest circumference with a fat-free body mass and a skinny body mass may indicate sufficient development of skeletal muscles, which is a positive point undoubtedly. Conclusion. The results of the analysis of the physical development dynamics of students in grades 1-5 demonstrated the continuation of acceleration processes in the child population. At the same time, no evidence was found to support the occurrence of an unfavorable scenario involving a significant increase in body weight and fat component. The obtained results emphasize the relevance and necessity of further systematic monitoring of the physical development status of children and adolescents, as well as the implementation of preventive measures aimed at strengthening and preserving their health in the post-pandemic period.